Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a fragmentary enlarged front view showing the details of the tread portion thereof; and,

FIG. 6 is a section view taken along line 6-6 in FIG. 5.

The broken lines are for the purpose of showing environmental structure only and form no part of the claimed design.

The dot-dash-dot broken line depicts the location and borders of an enlarged fragmentary view and forms no part of the claim. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 